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avcodec/vp3: Error out on invalid num_coeffs in unpack_vlcs() 

This fixes a hypothetical integer overflow

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-11 03:38:54 +01:00
parent 63a4bdbf3b
commit f2318aee8c
1 changed files with 3 additions and 1 deletions
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4
libavcodec/vp3.c
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@ -951,9 +951,11 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
Vp3Fragment *all_fragments = s->all_fragments;
VLC_TYPE(*vlc_table)[2] = table->table;
if (num_coeffs < 0)
if (num_coeffs < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Invalid number of coefficients at level %d\n", coeff_index);
return AVERROR_INVALIDDATA;
}
if (eob_run > num_coeffs) {
coeff_i =